6G9T

CRYSTAL STRUCTURE OF CMY-136 class C BETA-LACTAMASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.236 

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This is version 1.2 of the entry. See complete history


Literature

Genetic, Biochemical, and Structural Characterization of CMY-136 beta-Lactamase, a Peculiar CMY-2 Variant.

Zavala, A.Retailleau, P.Elisee, E.Iorga, B.I.Naas, T.

(2019) ACS Infect Dis 5: 528-538

  • DOI: 10.1021/acsinfecdis.8b00240
  • Primary Citation of Related Structures:  
    6G9T

  • PubMed Abstract: 
  • With the widespread use and abuse of antibiotics for the past decades, antimicrobial resistance poses a serious threat to public health nowadays. β-Lactams are the most used antibiotics, and β-lactamases are the most widespread resistance mechanism. Class C β-lactamases, also known as cephalosporinases, usually do not hydrolyze the latest and most potent β-lactams, expanded spectrum cephalosporins and carbapenems ...

    With the widespread use and abuse of antibiotics for the past decades, antimicrobial resistance poses a serious threat to public health nowadays. β-Lactams are the most used antibiotics, and β-lactamases are the most widespread resistance mechanism. Class C β-lactamases, also known as cephalosporinases, usually do not hydrolyze the latest and most potent β-lactams, expanded spectrum cephalosporins and carbapenems. However, the recent emergence of extended-spectrum AmpC cephalosporinases, their resistance to inhibition by classic β-lactamase inhibitors, and the fact that they can contribute to carbapenem resistance when paired with impermeability mechanisms, means that these enzymes may still prove worrisome in the future. Here we report and characterize the CMY-136 β-lactamase, a Y221H point mutant derivative of CMY-2. CMY-136 confers an increased level of resistance to ticarcillin, cefuroxime, cefotaxime, and ceftolozane/tazobactam. It is also capable of hydrolyzing ticarcillin and cloxacillin, which act as inhibitors of CMY-2. X-ray crystallography and modeling experiments suggest that the hydrolytic profile alterations seem to be the result of an increased flexibility and altered conformation of the Ω-loop, caused by the Y221H mutation.


    Organizational Affiliation

    Evolution and Ecology of Resistance to Antibiotics Unit , Institut Pasteur, APHP, Université Paris Sud , 25-28 Rue du Dr Roux , 75015 Paris , France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-lactamaseA, B371Escherichia coliMutation(s): 1 
Gene Names: blaCMY-61
EC: 3.5.2.6
UniProt
Find proteins for G3F7G9 (Escherichia coli)
Explore G3F7G9 
Go to UniProtKB:  G3F7G9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.236 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.58α = 90
b = 58.09β = 89.97
c = 100.08γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
FranceANR-10-LABX-33

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-27
    Type: Initial release
  • Version 1.1: 2019-03-06
    Changes: Data collection, Database references
  • Version 1.2: 2019-04-24
    Changes: Data collection, Database references